US20060073338A1 - Formulation for the manufacture of carbon-carbon composite materials - Google Patents
Formulation for the manufacture of carbon-carbon composite materials Download PDFInfo
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- US20060073338A1 US20060073338A1 US10/956,582 US95658204A US2006073338A1 US 20060073338 A1 US20060073338 A1 US 20060073338A1 US 95658204 A US95658204 A US 95658204A US 2006073338 A1 US2006073338 A1 US 2006073338A1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/83—Carbon fibres in a carbon matrix
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63496—Bituminous materials, e.g. tar, pitch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/604—Pressing at temperatures other than sintering temperatures
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/614—Gas infiltration of green bodies or pre-forms
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6586—Processes characterised by the flow of gas
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
Definitions
- This invention relates to carbon-carbon composite materials such as those used to make friction components.
- a particularly preferred embodiment of this invention is an aircraft landing system brake disc made from the improved carbon-carbon composite formulation described herein.
- Carbon-carbon composite materials may be made from fibrous materials such as carbon fibers or carbon fiber precursors. In the course of manufacturing the carbon-carbon composites, these fibrous materials are generally mixed with binders.
- One type of such carbon-carbon composites is made with chopped fibers mixed with pitch-based thermoplastic binder in powder form. The mixture is placed in a mold where it is compacted and heated to form a preform, and the resulting preform is carbonized by heating it.
- pitch-based thermoplastic binders tend to become liquid and to foam as the temperature increases during carbonization. This liquid phase pitch may run out of the preform during the carbonization process. In order to avoid foaming and run out, the preform is conventionally subjected to a lengthy oxidative stabilization process prior to carbonization.
- One embodiment of the present invention is a composition suitable for manufacturing a carbon-carbon composite preform.
- This composition entails a mixture of carbon fiber or carbon fiber precursor.
- Carbon fiber precursors include stabilized pitch fibers and oxidized polyacrylonitrile (PAN) fibers. During a charring operation, the carbon fiber precursors are converted into carbon fibers.
- the present invention contemplates that 15-60 parts by weight of chopped carbon fiber or chopped carbon fiber precursor are mixed with 28-83 parts by weight of thermoplastic pitch binder powder and 1-12 parts by weight of activated carbon powder.
- 45-55 parts by weight of chopped carbon fiber or carbon fiber precursor are mixed with 40-50 parts by weight of pitch binder powder and 2.5-7.5 parts by weight of activated carbon.
- a particularly preferred embodiment mixes 50 weight-% chopped carbon fiber, 45 weight-% thermoplastic pitch binder powder, and 5 weight-% activated carbon powder.
- Another embodiment of this invention is a compacted carbon-carbon composite preform comprising a molded mixture, wherein the mixtures that may be molded are those described above.
- the compacted preform at least 2 weight-% of said thermoplastic binder is adsorbed to said activated carbon.
- the preform of this invention is configured as a brake disc for an aircraft landing system.
- the present invention also contemplates a method for carbonizing a preform.
- this method mixes: (a) chopped carbon fiber, chopped stabilized pitch fiber, or chopped oxidized PAN fiber; (b) thermoplastic pitch binder powder; and (c) activated carbon powder, to form a mixture of 15-60 parts by weight of chopped carbon fiber or chopped stabilized pitch fiber or chopped oxidized PAN, 28-83 parts by weight of thermoplastic pitch binder powder, and 1-12 parts by weight of activated carbon powder.
- the mixture is deposited into a mold, where it is pressed and heated to form a preform by compaction.
- the compression molding parameters are not critical to the present invention.
- the pressing/heating step may be conducted, for instance, at temperatures in the range 180-300° C.
- the compacted preform is removed from the mold and carbonized by generally conventional means.
- the carbonization parameters are not critical. Carbonization may be carried out, e.g., in an inert atmosphere at a temperature of from 750 to 1200° C. for from 1 ⁇ 2 to 2 hours.
- Carbonized preforms prepared by the method of the present invention typically weigh at least 3% more than do carbonized preforms made by otherwise identical processes in which the activated carbon powder is replaced by thermoplastic pitch binder powder.
- the carbonized preform of this invention may be densified by conventional means, such as CVI/CVD processing. Where the preform is configured as a brake disc, it may subsequently be used as a component in a braking system, e.g., in an aircraft landing system.
- FIG. 1A is a photograph showing exposed interior cross-sections of two discs of the present invention and one disc that was prepared for comparative purposes.
- FIG. 1B is a photographic perspective view of the three disc cross-sections shown in FIG. 1A .
- Chopped oxidized PAN fibers are placed in a mixing vessel. Alternatively, one may place chopped carbon fibers or chopped stabilized pitch fibers in the mixing vessel. Powdered pitch-based thermoplastic binder is also placed in the mixing vessel.
- activated carbon is substituted for a portion of the thermoplastic binder that is mixed with the chopped fibers.
- the two ingredients are mixed thoroughly, and then decanted into a mold, e.g., an annular brake disc mold. In the mold, the mixture is simultaneously pressed and heated, in order to adsorb the more mobile (e.g., lower molecular weight) fraction of the binder to the activated carbon. Typically, at least 2 weight-% of the binder employed will be adsorbed to the activated carbon.
- the preform is cooled and removed from the press. The compacted preform is then subjected to conventional carbonization procedures.
- Example 1 50 parts by weight of chopped carbon fibers were placed in a mixing vessel. Separately, 45 parts by weight, based on the weight of the fibers, of Kopper's pitch (melting point 180° C.) in powder form was mixed with 5 parts by weight, based on the weight of the fibers, of activated carbon, and the pitch/activated carbon binder mixture was added to the mixing vessel containing the fibers. The fibers and binder mixture were mixed thoroughly, providing a random fiber orientation, and then molded into the shape of an annular brake disc preform having an outside diameter of 20 inches, an inner diameter of 10 inches, and a thickness of 2.5 inches. Molding was conducted at a pressure that reached 2000 psi and a temperature that reached 240° C.
- the preform was removed from the mold and placed in a fixture that masked its top and bottom faces.
- This mask fixture is described in detail in U.S. patent application Ser. No. 10/942,222, filed Sep. 16, 2004.
- the preform was heated at ambient pressure in a non-reactive nitrogen atmosphere to a temperature of 900° C. and maintained at that temperature for 1 hour, in order to carbonize the pitch binder making up the preform.
- Example 2 50 parts by weight of chopped carbon fibers were placed in a mixing vessel. Separately, 47.5 parts by weight, based on the weight of the fibers, of Kopper's pitch (melting point 180° C.) in powder form was mixed with 2.5 parts by weight, based on the weight of the fibers, of activated carbon, and the pitch/activated carbon binder mixture was added to the mixing vessel containing the fibers. The fibers and binder mixture were mixed thoroughly, providing a random fiber orientation, and then molded into the shape of an annular brake disc preform having an outside diameter of 20 inches, an inner diameter of 10 inches, and a thickness of 2.5 inches. Molding was conducted at a pressure that reached 2000 psi and a temperature that reached 240° C.
- the preform was removed from the mold and placed in a fixture that masked its top and bottom faces.
- This mask fixture is described in detail in U.S. patent application Ser. No. 10/942,222, filed Sep. 16, 2004.
- the preform was heated at ambient pressure in a non-reactive nitrogen atmosphere to a temperature of 900° C. and maintained at that temperature for 1 hour, in order to carbonize the pitch binder making up the preform.
- Comparative Example 50 parts by weight of chopped carbon fibers were placed in a mixing vessel. Separately, 50 parts by weight, based on the weight of the fibers, of Kopper's pitch (melting point 180° C.) in powder form was added to the mixing vessel containing the fibers. The fibers and binder mixture were mixed thoroughly, providing a random fiber orientation, and then molded into the shape of an annular brake disc preform having an outside diameter of 20 inches, an inner diameter of 10 inches, and a thickness of 2.5 inches. Molding was conducted at a pressure that reached 2000 psi and a temperature that reached 240° C. After molding, the preform was removed from the mold and placed in a fixture that masked its top and bottom faces. This mask fixture is described in detail in U.S.
- FIGS. 1A and 1B are photographs of the sectionalized discs.
- FIG. 1A looks directly down onto the exposed interiors of the discs.
- FIG. 1B is a perspective view, showing the exposed interiors of the discs and the outer edges of the discs.
- the disc made in the Comparative Example is numbered “1” in the photographs.
- the disc made in Example 1 is numbered 5 in the photographs.
- the disc made in Example 2 is numbered 4 in the photographs. During the carbonization step, run out tends to occur. Visual inspection of disc No.
- the present invention provides carbon-carbon composite brake disc preforms that have far less voids than do discs made by otherwise similar processes but without the use of activated carbon. This invention enables preforms made in accordance with the present invention to reach the desired density with fewer subsequent densification cycles, resulting in a significant improvement in the economics of brake disc manufacturing.
Abstract
Description
- This invention relates to carbon-carbon composite materials such as those used to make friction components. A particularly preferred embodiment of this invention is an aircraft landing system brake disc made from the improved carbon-carbon composite formulation described herein.
- Carbon-carbon composite materials may be made from fibrous materials such as carbon fibers or carbon fiber precursors. In the course of manufacturing the carbon-carbon composites, these fibrous materials are generally mixed with binders. One type of such carbon-carbon composites is made with chopped fibers mixed with pitch-based thermoplastic binder in powder form. The mixture is placed in a mold where it is compacted and heated to form a preform, and the resulting preform is carbonized by heating it. However, pitch-based thermoplastic binders tend to become liquid and to foam as the temperature increases during carbonization. This liquid phase pitch may run out of the preform during the carbonization process. In order to avoid foaming and run out, the preform is conventionally subjected to a lengthy oxidative stabilization process prior to carbonization.
- It has been found that incorporating from 1 to 12 weight-% activated carbon powder into the preform mixture prior to preform formation (compaction) can reduce or eliminate foaming problems in subsequent carbonization processing. This enables manufacturers to omit oxidative stabilization of the preform mixture in the compaction mold and enables more rapid subsequent carbonization of the preform.
- One embodiment of the present invention is a composition suitable for manufacturing a carbon-carbon composite preform. This composition entails a mixture of carbon fiber or carbon fiber precursor. Carbon fiber precursors include stabilized pitch fibers and oxidized polyacrylonitrile (PAN) fibers. During a charring operation, the carbon fiber precursors are converted into carbon fibers. The present invention contemplates that 15-60 parts by weight of chopped carbon fiber or chopped carbon fiber precursor are mixed with 28-83 parts by weight of thermoplastic pitch binder powder and 1-12 parts by weight of activated carbon powder. Preferably, 45-55 parts by weight of chopped carbon fiber or carbon fiber precursor are mixed with 40-50 parts by weight of pitch binder powder and 2.5-7.5 parts by weight of activated carbon. A particularly preferred embodiment mixes 50 weight-% chopped carbon fiber, 45 weight-% thermoplastic pitch binder powder, and 5 weight-% activated carbon powder.
- Another embodiment of this invention is a compacted carbon-carbon composite preform comprising a molded mixture, wherein the mixtures that may be molded are those described above. In the compacted preform, at least 2 weight-% of said thermoplastic binder is adsorbed to said activated carbon. Most preferably, the preform of this invention is configured as a brake disc for an aircraft landing system.
- The present invention also contemplates a method for carbonizing a preform. In a first step, this method mixes: (a) chopped carbon fiber, chopped stabilized pitch fiber, or chopped oxidized PAN fiber; (b) thermoplastic pitch binder powder; and (c) activated carbon powder, to form a mixture of 15-60 parts by weight of chopped carbon fiber or chopped stabilized pitch fiber or chopped oxidized PAN, 28-83 parts by weight of thermoplastic pitch binder powder, and 1-12 parts by weight of activated carbon powder. The mixture is deposited into a mold, where it is pressed and heated to form a preform by compaction. The compression molding parameters are not critical to the present invention. The pressing/heating step may be conducted, for instance, at temperatures in the range 180-300° C. and at pressures in the range 1600-2400 psi. Finally, the compacted preform is removed from the mold and carbonized by generally conventional means. Again, the carbonization parameters are not critical. Carbonization may be carried out, e.g., in an inert atmosphere at a temperature of from 750 to 1200° C. for from ½ to 2 hours. Carbonized preforms prepared by the method of the present invention typically weigh at least 3% more than do carbonized preforms made by otherwise identical processes in which the activated carbon powder is replaced by thermoplastic pitch binder powder. In follow-on processing, the carbonized preform of this invention may be densified by conventional means, such as CVI/CVD processing. Where the preform is configured as a brake disc, it may subsequently be used as a component in a braking system, e.g., in an aircraft landing system.
- The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings that are given by way of illustration only, and thus do not limit the present invention.
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FIG. 1A is a photograph showing exposed interior cross-sections of two discs of the present invention and one disc that was prepared for comparative purposes. -
FIG. 1B is a photographic perspective view of the three disc cross-sections shown inFIG. 1A . - PROCESSING. Chopped oxidized PAN fibers are placed in a mixing vessel. Alternatively, one may place chopped carbon fibers or chopped stabilized pitch fibers in the mixing vessel. Powdered pitch-based thermoplastic binder is also placed in the mixing vessel. In accordance with the present invention, activated carbon is substituted for a portion of the thermoplastic binder that is mixed with the chopped fibers. The two ingredients (fibers and binder powder) are mixed thoroughly, and then decanted into a mold, e.g., an annular brake disc mold. In the mold, the mixture is simultaneously pressed and heated, in order to adsorb the more mobile (e.g., lower molecular weight) fraction of the binder to the activated carbon. Typically, at least 2 weight-% of the binder employed will be adsorbed to the activated carbon. After thermal compaction in this manner, the preform is cooled and removed from the press. The compacted preform is then subjected to conventional carbonization procedures.
- Example 1. 50 parts by weight of chopped carbon fibers were placed in a mixing vessel. Separately, 45 parts by weight, based on the weight of the fibers, of Kopper's pitch (melting point 180° C.) in powder form was mixed with 5 parts by weight, based on the weight of the fibers, of activated carbon, and the pitch/activated carbon binder mixture was added to the mixing vessel containing the fibers. The fibers and binder mixture were mixed thoroughly, providing a random fiber orientation, and then molded into the shape of an annular brake disc preform having an outside diameter of 20 inches, an inner diameter of 10 inches, and a thickness of 2.5 inches. Molding was conducted at a pressure that reached 2000 psi and a temperature that reached 240° C. After molding, the preform was removed from the mold and placed in a fixture that masked its top and bottom faces. This mask fixture is described in detail in U.S. patent application Ser. No. 10/942,222, filed Sep. 16, 2004. In the mask fixture, the preform was heated at ambient pressure in a non-reactive nitrogen atmosphere to a temperature of 900° C. and maintained at that temperature for 1 hour, in order to carbonize the pitch binder making up the preform.
- Example 2. 50 parts by weight of chopped carbon fibers were placed in a mixing vessel. Separately, 47.5 parts by weight, based on the weight of the fibers, of Kopper's pitch (melting point 180° C.) in powder form was mixed with 2.5 parts by weight, based on the weight of the fibers, of activated carbon, and the pitch/activated carbon binder mixture was added to the mixing vessel containing the fibers. The fibers and binder mixture were mixed thoroughly, providing a random fiber orientation, and then molded into the shape of an annular brake disc preform having an outside diameter of 20 inches, an inner diameter of 10 inches, and a thickness of 2.5 inches. Molding was conducted at a pressure that reached 2000 psi and a temperature that reached 240° C. After molding, the preform was removed from the mold and placed in a fixture that masked its top and bottom faces. This mask fixture is described in detail in U.S. patent application Ser. No. 10/942,222, filed Sep. 16, 2004. In the mask fixture, the preform was heated at ambient pressure in a non-reactive nitrogen atmosphere to a temperature of 900° C. and maintained at that temperature for 1 hour, in order to carbonize the pitch binder making up the preform.
- Comparative Example. 50 parts by weight of chopped carbon fibers were placed in a mixing vessel. Separately, 50 parts by weight, based on the weight of the fibers, of Kopper's pitch (melting point 180° C.) in powder form was added to the mixing vessel containing the fibers. The fibers and binder mixture were mixed thoroughly, providing a random fiber orientation, and then molded into the shape of an annular brake disc preform having an outside diameter of 20 inches, an inner diameter of 10 inches, and a thickness of 2.5 inches. Molding was conducted at a pressure that reached 2000 psi and a temperature that reached 240° C. After molding, the preform was removed from the mold and placed in a fixture that masked its top and bottom faces. This mask fixture is described in detail in U.S. patent application Ser. No. 10/942,222, filed Sep. 16, 2004. In the mask fixture, the preform was heated at ambient pressure in a non-reactive nitrogen atmosphere to a temperature of 900° C. and maintained at that temperature for 1 hour, in order to carbonize the pitch binder making up the preform.
- RESULTS. The carbon-carbon composite brake disc preforms prepared in Examples 1 and 2 and in the Comparative Example were cut in half along their diameters, exposing cross-sections of the materials at the interior of the discs.
FIGS. 1A and 1B are photographs of the sectionalized discs.FIG. 1A looks directly down onto the exposed interiors of the discs.FIG. 1B is a perspective view, showing the exposed interiors of the discs and the outer edges of the discs. The disc made in the Comparative Example is numbered “1” in the photographs. The disc made in Example 1 is numbered 5 in the photographs. The disc made in Example 2 is numbered 4 in the photographs. During the carbonization step, run out tends to occur. Visual inspection of disc No. 1 shows pronounced run out at its outer edge. Discs Nos. 4 and 5 are almost free of run out at their outer edges. The disc preforms were weighed before and after carbonization. The starting and ending weights, and % yields, are shown in Table 1:TABLE 1 Disc Start weight Charred weight Yield 1 (Comparative) 7130 6068 85.1% 4 (Example 2) 7060 6327 89.6% 5 (Example 1) 7005 6403 91.4% - The present invention provides carbon-carbon composite brake disc preforms that have far less voids than do discs made by otherwise similar processes but without the use of activated carbon. This invention enables preforms made in accordance with the present invention to reach the desired density with fewer subsequent densification cycles, resulting in a significant improvement in the economics of brake disc manufacturing.
Claims (13)
Priority Applications (2)
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US10/956,582 US7438839B2 (en) | 2004-10-01 | 2004-10-01 | Formulation for the manufacture of carbon-carbon composite materials |
PCT/US2005/035096 WO2006039443A2 (en) | 2004-10-01 | 2005-09-29 | Improved formulation for the manufacture of carbon-carbon composite materials |
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US10/956,582 US7438839B2 (en) | 2004-10-01 | 2004-10-01 | Formulation for the manufacture of carbon-carbon composite materials |
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US7438839B2 US7438839B2 (en) | 2008-10-21 |
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Cited By (4)
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CN104495838A (en) * | 2014-12-12 | 2015-04-08 | 河南省科学院化学研究所有限公司 | Method for preparing activated carbon |
EP3093113A1 (en) * | 2015-05-14 | 2016-11-16 | Goodrich Corporation | Process for forming carbon composite materials |
KR20210148568A (en) * | 2020-05-30 | 2021-12-08 | 극동씰테크 주식회사 | Carbon material rotor and vane for vehicle vacuum pump and manufacturing method thereof |
EP4104995A1 (en) * | 2021-06-18 | 2022-12-21 | Goodrich Corporation | Wedge and plug tooling for pre-carbonization compression of oxidized pan fiber preform |
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KR102040742B1 (en) | 2009-07-17 | 2019-11-05 | 씨에프피 콤포지츠 리미티드 | A fibre matrix and a method of making a fibre matrix |
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CN104495838A (en) * | 2014-12-12 | 2015-04-08 | 河南省科学院化学研究所有限公司 | Method for preparing activated carbon |
EP3093113A1 (en) * | 2015-05-14 | 2016-11-16 | Goodrich Corporation | Process for forming carbon composite materials |
US10011534B2 (en) | 2015-05-14 | 2018-07-03 | Goodrich Corporation | Process for forming carbon composite materials |
KR20210148568A (en) * | 2020-05-30 | 2021-12-08 | 극동씰테크 주식회사 | Carbon material rotor and vane for vehicle vacuum pump and manufacturing method thereof |
KR102410956B1 (en) | 2020-05-30 | 2022-06-21 | 극동씰테크 주식회사 | Carbon material rotor and vane for vehicle vacuum pump and manufacturing method thereof |
EP4104995A1 (en) * | 2021-06-18 | 2022-12-21 | Goodrich Corporation | Wedge and plug tooling for pre-carbonization compression of oxidized pan fiber preform |
Also Published As
Publication number | Publication date |
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WO2006039443A2 (en) | 2006-04-13 |
WO2006039443A3 (en) | 2006-06-22 |
US7438839B2 (en) | 2008-10-21 |
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